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George Wells Beadle
File:George W. Beadle.jpg
Born October 22, 1903(1903-10-22)
Wahoo, Nebraska, USA
Died June 9, 1989 (aged 85)
Chicago, Illinois, USA
Fields Genetics
Institutions California Institute of Technology
University of Chicago
Harvard University
Stanford University
Alma mater University of Nebraska, Cornell University
Doctoral advisor Franklin D. Keim
Known for Gene regulation of biochemical events within cells
Notable awards Nobel Prize in Physiology or Medicine

George Wells Beadle (October 22, 1903 – June 9, 1989) was an American scientist in the field of genetics, and Nobel Prize in Physiology or Medicine Nobel laureate who with Edward Lawrie Tatum discovered the role of genes in regulating biochemical events within cells.

Beadle and Tatum's key experiments involved exposing the bread mold Neurospora crassa to x-rays, causing mutations. In a series of experiments, they showed that these mutations caused changes in specific enzymes involved in metabolic pathways. These experiments led them to propose a direct link between genes and enzymatic reactions, known as the "one gene, one enzyme" hypothesis.

Biography

Beadle was born in Wahoo, Nebraska. He received his Bachelor of Science degree in agronomy from the University of Nebraska's College of Agriculture in 1926 where he was a member of FarmHouse fraternity. At the recommendation of his advisor, Franklin D. Keim, he then entered graduate school in agronomy at Cornell University, intending to study ecology. He soon switched his focus to genetics and cytology, pursuing research on maize (corn) genetics under Rollins Adams Emerson—including some collaboration with Barbara McClintock. He received his Ph.D. from Cornell in 1931.[1]

For post-doctoral work, Beadle joined Thomas Hunt Morgan's "fly lab" at the California Institute of Technology, where he worked with Alfred Sturtevant and others on Drosophila genetics. There, working with Boris Ephrussi, he helped develop a technique for transplanting foreign cells in fly larvae (creating a third eye in flies' abdomens); this technique was used to demonstrate that some mutations affecting eye color involved genes that controlled specific metabolic steps in the production of eye pigment. In an effort to precisely characterize the reactions and substances involved, he recruited biochemist Edward Tatum to work on the pigment problem as well. They eventually isolated and identified the pigment precursor found in the "vermilion" mutant, but did so shortly after an independent German group. Over the course of his Drosophila work, Beadle was a professor at Harvard University, then Stanford University.[2]

With Tatum, Beadle switched his focus to a model organism more suited to biochemical genetics: Neurospora. By constructing mutant strains that required specific nutritional elements (amino acids or vitamins), they established that individual gene mutations were responsible for individual steps in the metabolism and synthesis of vital nutrients. This led, in 1941, to propose the "one gene-one enzyme hypothesis," the idea that a gene specifies a single enzyme, rather than a complex set of characteristics (as was generally assumed).[3]

In 1946, with the support of Linus Pauling, Beadle was recruited to head the newly reorganized biology division of Caltech; the department was one of the prototypes in the field that would become known as molecular biology. During the early Cold War, Beadle was outspoken in his defense of colleagues under investigation for suspected Communist ties, and also worked on defining and publicizing the potential dangers of nuclear weapons-related radiation. In 1958, Beadle and Tatum were awarded the Nobel Prize in Physiology and Medicine for their work on biochemical genetics. Beadle went on to serve as president of the University of Chicago from 1961-1968, helping—through fund-raising and recruitment—to re-establish its reputation as a top research university. He published a book, The Language of Life, in 1966.[4]

Following his retirement as university president, Beadle returned to research, now on the evolutionary relationship between corn and teosinte. He continued research until the late 1970s, when Alzheimer's disease made continued intellectual work impossible. George Beadle died in 1989; his second wife Muriel Barnett Beadle died in 1994. He had one son, David (b. 1931), with his first wife Marion Hill Beadle.[5]

References

  1. ^ Berg and Singer, George Beadle: An Uncommon Farmer, chapters 1-4
  2. ^ Berg and Singer, George Beadle: An Uncommon Farmer, chapters 5-9
  3. ^ Berg and Singer, George Beadle: An Uncommon Farmer, chapters 9-11
  4. ^ Berg and Singer, George Beadle: An Uncommon Farmer, chapters 12-17
  5. ^ Berg and Singer, George Beadle: An Uncommon Farmer, chapters 18-19

External links

  • Paul Berg and Maxine Singer. George Beadle: An Uncommon Farmer. The Emergence of Genetics in the 20th Century. Cold Springs Harbor Laboratory Press, 2003. ISBN 0-87969-688-5
  • Nobel Lectures, Physiology or Medicine 1942-1962, Elsevier Publishing Company, Amsterdam, 1964
  • Key Participants: George Beadle - It's in the Blood! A Documentary History of Linus Pauling, Hemoglobin, and Sickle Cell Anemia
Academic offices
Preceded by
Lawrence A. Kimpton
President of the University of Chicago
1961—1968
Succeeded by
Edward H. Levi
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